1. Interplanetary magnetic field over two solar cycles and out to 20 AU;Smith;Adv. Space Res.,1989
2. E.J. Smith, J.A. Slavin, and B.T. Thomas, The heliospheric current sheet: 3 dimensional structure and solar cycle changes, in: ESLAB Symposium on the Three Dimensional Structure of the Heliosphere. ed. R.G. Marsden, D. Reidel, Hingham, Mass. 1986, p. 267.
3. Interplanetary Dynamical Processes;Parker,1963
4. The Parker spiral configuration of the interplanetary magnetic field between 1 and 8.5 AU;Thomas;J. Geophys. Res.,1980
5. D. Winterhalter, E.J. Smith, and J.A. Slavin, The radial gradient in the interplanetary magnetic field between 1 and 23 AU, in: Solar Wind 6. eds. V.J. Pizzo, T.E. Holzer, and D.G Sime, NCAR/TN-306, HAO/NCAR, Boulder, Colorado, U.S.A. 1988, p. 587.